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Ksenya-84 [330]
3 years ago
12

Note: Enter your answer and show all the steps that you use to solve this problem in the space provided. Write and solve an equa

tion for the situation. Eight and one-half years ago, Steven was 7 years old. How old is he now?
Please explain as they say.
Mathematics
1 answer:
MariettaO [177]3 years ago
7 0

Answer:

<u><em>Steven is 15 and one half years old now</em></u>

Step-by-step explanation:

<u />

Linear equations

Sometimes we need to know the value of a variable in a given equation and that variable is given as a polynomial of degree 1. Solving for that variable means isolating it and replacing the other known values

Steven was 7 years old eight and one-half years ago. If we call x as the actual age of Steven, his age eight and one-half years ago was

x-8\frac{1}{2}

We know he was 7 years old then, so

x-8\frac{1}{2}=7

We need to know his actual age, so let's solve for x, adding 8\frac{1}{2} to each side of the equation

x-8\frac{1}{2}+8\frac{1}{2}=7+8\frac{1}{2}

Simplifying

x=15\frac{1}{2}

Steven is 15 and one half years old now

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We can solve this problem using complementary events. Two events are said to be complementary if one negates the other, i.e. E and F are complementary if

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